Improvements
* Improvement of the different `requirements.txt` and `requirements-ci.txt` files.
[(212)](https://github.com/PennyLaneAI/pennylane-qiskit/pull/212)
* The plugin now natively supports the adjoint of the `S`, `T`, and `SX` gates.
[(216)](https://github.com/PennyLaneAI/pennylane-qiskit/pull/216)
Documentation
* Use the centralized [Xanadu Sphinx Theme](https://github.com/XanaduAI/xanadu-sphinx-theme)
to style the Sphinx documentation.
[(215)](https://github.com/PennyLaneAI/pennylane-qiskit/pull/215)
Bug fixes
* Defines the missing `returns_state` entry of the
`capabilities` dictionary for devices.
[(220)](https://github.com/PennyLaneAI/pennylane-qiskit/pull/220)
Contributors
This release contains contributions from (in alphabetical order):
Mikhail Andrenkov, Christina Lee, Romain Moyard, Antal Száva
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